Metal Finishing Guide Book


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Page 96 of 903

Sulfuric acid, 15-60% Water, balance STEEL Steel is more difficult to electropolish to the same degree of perfection as other metals, owing to variations. It has good potential in industrial applications, as well as for brightening and smoothing; however, results are not consistent because of great variations in composition and surface conditions from mills and/or heat treatment. R. Delaplace and C. Bechard Pyrophosphoric acid, 400 g Ethyl alcohol to make 1 L Temperature, 20��F Current density, 300 A/ft2 Cooling of the electrolyte is required, and water must be absent. C. Faust Sulfuric acid, 15% Phosphoric acid, 63% Chromic acid, 10% Current density, 50-1,000 A/ft2 Temperature, 125��F This solution has a finite life. Weisberg and Levin Lactic acid, 33% Phosphoric acid, 40% Sulfuric acid, 15.5% Current density, 100 A/ft2 Temperature, 65-90��F Polishing rate is quite low; 1-2 hr are required. Hammond, Edgeworth, and Bowman Phosphoric acid, 55-85% Trialkali metal phosphate, 1-15% Alkali metal sulfate, 0.5% minimum Stainless Steel Stainless steel is the most popular electropolished metal today. It retains its finish, and no aftertreatment is required. H. Uhlig Phosphoric acid and glycerine, 90% Glycerin, >50% Current density, >20 A/ft2 Temperature, >200��F J. Ostrofsky Citric acid, 55% Sulfuric acid, 15% 93

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